otherfunctions.cpp

Kademlia---第第3代P2P原代码

//this file is part of eMule
//Copyright (C)2002 Merkur ( [e-mail] / http://www.emule-project.net )
//
//This program is free software; you can redistribute it and/or
//modify it under the terms of the GNU General Public License
//as published by the Free Software Foundation; either
//version 2 of the License, or (at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

#include "stdafx.h"
#include "otherfunctions.h"

bool IsGoodIP(uint32 nIP)
{
	// always filter following IP's
	// -------------------------------------------
	//	 0.0.0.0
	// 127.*.*.*						localhost

	if (nIP==0 || (uint8)nIP==127)
		return false;

//	if (!theApp.glob_prefs->FilterBadIPs())
//		return true;

	// filter LAN IP's
	// -------------------------------------------
	//	0.*
	//	10.0.0.0 - 10.255.255.255		class A
	//	172.16.0.0 - 172.31.255.255		class B
	//	192.168.0.0 - 192.168.255.255	class C

	uint8 nFirst = (uint8)nIP;
	uint8 nSecond = (uint8)(nIP >> 8);

#ifndef DEBUG
	if (nFirst==192 && nSecond==168) // check this 1st, because those LANs IPs are mostly spreaded
		return false;
#endif

	if (nFirst==172 && nSecond>=16 && nSecond<=31)
		return false;

	if (nFirst==0 || nFirst==10)
		return false;

	return true; 
}

bool IsGoodIPPort(uint32 nIP, uint16 nPort)
{
	return IsGoodIP(nIP) && nPort!=0;
}

int GetSystemErrorString(DWORD dwError, CString &rstrError)
{
	// FormatMessage language flags:
	//
	// - MFC uses: MAKELANGID(LANG_NEUTRAL, SUBLANG_SYS_DEFAULT)
	//				SUBLANG_SYS_DEFAULT = 0x02 (system default)
	//
	// - SDK uses: MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT)
	//				SUBLANG_DEFAULT		= 0x01 (user default)
	//
	//
	// Found in "winnt.h"
	// ------------------
	//  Language IDs.
	//
	//  The following two combinations of primary language ID and
	//  sublanguage ID have special semantics:
	//
	//    Primary Language ID   Sublanguage ID      Result
	//    -------------------   ---------------     ------------------------
	//    LANG_NEUTRAL          SUBLANG_NEUTRAL     Language neutral
	//    LANG_NEUTRAL          SUBLANG_DEFAULT     User default language
	//    LANG_NEUTRAL          SUBLANG_SYS_DEFAULT System default language
	//
	// *** SDK notes also:
	// If you pass in zero, 'FormatMessage' looks for a message for LANGIDs in 
	// the following order:
	//
	//	1) Language neutral 
	//	2) Thread LANGID, based on the thread's locale value 
	//  3) User default LANGID, based on the user's default locale value 
	//	4) System default LANGID, based on the system default locale value 
	//	5) US English 
	LPTSTR pszSysMsg = NULL;
	DWORD dwLength = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
								   NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_SYS_DEFAULT),
								   (LPTSTR)&pszSysMsg, 0, NULL);
	if (pszSysMsg != NULL && dwLength != 0)
	{
		if (dwLength >= 2 && pszSysMsg[dwLength - 2] == _T('\r'))
			pszSysMsg[dwLength - 2] = _T('\0');
		rstrError = pszSysMsg;
		rstrError.Replace(_T("\r\n"), _T(" ")); // some messages contain CRLF within the message!?
	}
	else {
		rstrError.Empty();
	}

	if (pszSysMsg)
		LocalFree(pszSysMsg);

	return rstrError.GetLength();
}

int GetModuleErrorString(DWORD dwError, CString &rstrError, LPCTSTR pszModule)
{
	LPTSTR pszSysMsg = NULL;
	DWORD dwLength = FormatMessage(FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
								   GetModuleHandle(pszModule), dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_SYS_DEFAULT),
								   (LPTSTR)&pszSysMsg, 0, NULL);
	if (pszSysMsg != NULL && dwLength != 0)
	{
		if (dwLength >= 2 && pszSysMsg[dwLength - 2] == _T('\r'))
			pszSysMsg[dwLength - 2] = _T('\0');
		rstrError = pszSysMsg;
		rstrError.Replace(_T("\r\n"), _T(" ")); // some messages contain CRLF within the message!?
	}
	else {
		rstrError.Empty();
	}

	if (pszSysMsg)
		LocalFree(pszSysMsg);

	return rstrError.GetLength();
}

int GetErrorMessage(DWORD dwError, CString &rstrErrorMsg, DWORD dwFlags)
{
	int iMsgLen = GetSystemErrorString(dwError, rstrErrorMsg);
	if (iMsgLen == 0)
	{
		if ((long)dwError >= 0)
			rstrErrorMsg.Format(_T("Error %u"), dwError);
		else
			rstrErrorMsg.Format(_T("Error 0x%08x"), dwError);
	}
	else if (dwFlags & 1)
	{
		CString strFullErrorMsg;
		if ((long)dwError >= 0)
			strFullErrorMsg.Format(_T("Error %u: %s"), dwError, rstrErrorMsg);
		else
			strFullErrorMsg.Format(_T("Error 0x%08x: %s"), dwError, rstrErrorMsg);
		rstrErrorMsg = strFullErrorMsg;
	}

	return rstrErrorMsg.GetLength();
}

CString GetErrorMessage(DWORD dwError, DWORD dwFlags)
{
	CString strError;
	GetErrorMessage(dwError, strError, dwFlags);
	return strError;
}